Question

A body starts with an initial velocity of 10m/s and is moving along a straight line with constant acceleration. When the velocity of the particle is 50m/s the acceleration is reversed in direction. The velocity of the particle when it again reaches the staring point is:​

Answer 1

Answer:

The velocity of the particle is 70 m/s.

Explanation:

Given that,

Initial velocity u = 10 m/s

Final velocity v = 50 m/s

When the body accelerated

Using equation of motion

....(I)

Now,The acceleration is reversed

Final velocity = 0

Initial velocity = 50 m/s

Using equation of motion again

.....(II)

The body starts moving in opposite direction from that point. after coming to the initial point.

The total distance s'' = s+s'

Let the velocity of the body is v'

Using equation of motion again,

Hence, The velocity of the particle is 70 m/s.